| 摘要 |
A micro tunnelling head and earth boring method is illustrated which includes utilizing a cutting head (G) spaced forwardly of a cylindrical articulated housing (A) having a transverse bulkhead (B) intermediate its ends for carrying a centrally disposed tube (C) carrying a driven auger (F) for operating the cutting head and removing the spoil inwardly from the housing through a chamber (D) which receives cuttings through a passageway (E) provided therein. Steering mechanism includes circumferentially spaced fluid operated cylinder assemblies (I) for pivotal fixation on adjacent ends of the articulated connection between the cylindrical housing (A) and a forward end of a casing for facilitating steering.
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